Yttrium

Symbol: YAtomic number: 39Category: transition metalsGroup: 3Period: 5Block: dAtomic weight: 88.90585 g/molElectrons per shell: 2, 8, 18, 9, 2CAS number: 7440-65-5Phase: solidDensity: 4.472 kg/l (near room temperature)Melting point: 1799 K (1526°C, 2779°F)Boiling point: 3609 K (3336°C, 6037°F)Crystal structure: hexagonalOxidation states: 3, 2, 1Electronegativity: 1.22 (Pauling scale)Name's origin: YtterbyName's meaning: a Swedish village which was the finding location of the mineral ytterbite
Facts:- is almost always found combined with the lanthanoids in rare earth minerals and is never found in nature as a free element
- the most important use of yttrium is in making phosphors, such as the red ones used in television cathode ray tube displays and in LEDs
- is a rare earth element along with scandium and the lantanides